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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f248ccfee32decf193267b77bb802897d0e2311ba344e1dd376711f39101a7' 
  AND token = 'QiCfnP41PJjFq3+r4tyUQ5LeDmQVzpFX0hNiEwRbJBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}